# The king does not desire any price for the bride except a hundred foreskins

"The king desires only a hundred foreskins as price for the bride" or "The king does not desire any price for the bride; he desires only that you bring to him a hundred foreskins" 

# foreskins

The foreskin is a fold of skin on a man's private part that is removed during circumcision.

# to be avenged from the king's enemies

"to get revenge on the king's enemies" 

# to make David fall by the hand of the Philistines

"to have the Philistines kill David"